stuck on o2

[westentertainer]

i have a sonyericson k800i open to all networks.but seems conifured to o2 .i cant use the internet options because i want to use my orange contract sim in the phone[orange wont change my g2 sim to a g3]because i purchased a different upgrade to this phone ..i also have a vodaphone 3g pay as u go sim ,,,any idea what would be the best cofiguration or if someone knows how to configure the settings many thanks

[Termy]

You should be able to get the relevant WAP/MMS settings off the network providers websites m8. Most networks will send you the setting straight to your handset.